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Help Use the orange and grey slider above the map to watch the weekly spread of infection. Below the red R is R naught, the number of other people an infected person is likely to infect. Below the graph, find many options for how to view the data behind what is happening as the disease spreads.

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Play Simulation
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Stop Simulation
When you play your simulation, it will show that you prevented so many infections, hospitalizations, and deaths that no icons remain on the map other than the initial infected. Review the legend to learn how many people were affected by this outbreak.
When you play through your simulation, you may notice there are no death icons on the map. The pathogen you chose can make people very sick, but has a low death rate, which may be part of why very few people died. To understand the effect of this pathogen, focus more on the number of infected.
When you play your simulation, it will show that you prevented so many infections and deaths that no icons remain on the map other than the initial infected. Review the legend to learn how many people were affected by this outbreak.
When you play through your simulation, you may notice there are no death icons on the map. The pathogen you chose can make people very sick, but has a low death rate, which may be part of why very few people died. To understand the effect of this pathogen, focus more on the number of infected.
When you play your simulation, it will show that you prevented so many infections and cases of paralysis that no icons remain on the map other than the initial infected. Review the legend to learn how many people were affected by this outbreak.
Key
Population Breakdown, Day 0
Want to save more lives? Save your simulation for comparison, then click on Run Again With Vaccinations to see how many people you could save by vaccinating. You can also click on Change Safety Measures and Run Again to see how many people you could save by increasing use of masks and distancing.
How many lives did you save with vaccination? Save your simulation for comparison, then click on Run Again Without Vaccinations to see how many people you saved by vaccinating. You can also click on Change Safety Measures and Run Again to see how many people you could save by increasing use of masks and distancing.
Save your simulation for comparison, then run another simulation.
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Numbers are rounded. If the number of people in a group isn’t more than 0.005% of the population, that group will be listed as 0%.

*Only susceptible people can be vaccinated. Those who are exposed, infected, recovered, or dead cannot be vaccinated.
Total people vaccinated can decrease over time, as sometimes immunity is lost after vaccination. This is not due to deaths. In the United States, tens of millions of people have received a COVID-19 vaccine and no one has died due to the vaccine.

**Exposed people include those in the incubation period before they are infectious.

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Numbers may differ from those above. In the simulation screen above, you are looking at specific day counts, while here it is total cumulative numbers. If you look at the last day above, it may also vary from this section because this also includes births and natural deaths in the total population.

To view the details of your saved simulations, visit the Compare Outbreaks page

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Graph
Safety Measures Implemented
Vaccine Statistics
Pathogen Summary
Table Data